Why would messaging be a winner-take-all market? I mean, it's just pushing around a bunch of bytes. Shouldn't be too difficult to specify.
(I'm not going to switch to the 2nd best app where I can only reach 10% of my friends.)
There is no reason why the social network of mankind should remain captured in the userbase of a single messaging app. And it is the abstract social network that does provide the network effects.
Would I be required to install a new app for checking an additional inbox?
It'd probably have to be a system where the server must verify that the number actually belongs to you by sending you a "traditional" SMS with an access code. You'd also need a trust network among the servers or else there would be servers announcing every telephone number out there as theirs.
Regarding the app, I guess any app that supports the protocol would do, even ones that also do other things. This should produce a healty app ecosystem.
Funny enough, they also fail to see that forcing people to adopt something doesn't work either. For a company that lives off advertising, they sure don't show much skill at marketing.
And the carriers charged 20 cents per SMS [1]? Yup, I remember those days. No thanks.
[1] http://gizmodo.com/5832245/atts-new-text-plan-overcharges-yo...